1. Question: According to the Levush what is the difference whether one corner of tzitzis broke and you only have to retie that corner, but if one corner was tied when the corners were rounded and then all four corners were made pointed and the rest of the corners were tied properly, you still have to redo all of them again?
A. There is a concept by tzitzis that they must be made in the right order, not that everything is done and automatically the mitzvah falls into place once it is all sorted.
B. Example of the wrong way is tying tzitzis on a three-corner garment then cutting a fourth corner and tying it. You have to retie all four corners because the four corners must be there first then tie them all.
C. The Magen Avraham questioned why the 3-corner case was a problem since the other corners were tied properly why should all the tzitzis be invalid since one was? Furthermore, the Machatzis Hashekel asks why it is no different than one tzitzis breaking, why isn’t it that the tzitzis on the other 3 corners are also invalidated and they all would have to be retied?
D. The Levush does say that all the tzitzis strings were made in an invalid state and stayed invalid because it was automatically set not made right, from the start.
E. The tallis is part of the mitzvah of tzitzis because the tallis and tzitzis become one piece of clothing.
Answer: Once one corner was made out of order then the whole garment is invalidated even if the other three tzitzis strings were tied after the fourth corner was cut out so all of them have to be redone but if all strings were tied properly on a kosher garment and then one string broke that does not mean all four have to be restrung because the garment is still valid, only the one string broke so only that one must be fixed.